
3COM CORPORATION

US ROBOTICS 33.6KBPS (INTERNAL)

US ROBOTICS VOICE 33.6KBPS (INTERNAL)

Card Type                       Modem
Chip Set                        Unidentified
I/O Options                     Line out, line in
Maximum Modem Rate              33.6Kbps
Maximum Fax Rate                14.4Kbps
Data Modulation Protocol        Bell 103A/212A, ITU-T V.21, V.22,
                                V.22bis,V.32, V.32bis, V.34, V.FC
Fax Modulation Protocol         V.17, V.21, CH2, V.27ter, V.29
Error Correction/Compression    MNP2-4, V.42
Fax Class                       Class I & II
Data Bus                        8-bit ISA
Card Size                       Half-length

[Image]

                                CONNECTIONS

        Function           Label             Function              Label

  RJ-11 telephone in            CN1      RJ-11 telephone out        CN2

             SERIAL PORT ADDRESS

    Setting      JP1/A     JP1/B     JP1/C

  COM1 (3F8h)    Closed    Closed    Closed

  COM2 (2F8h)     Open     Closed    Closed

  COM3 (3E8h)    Closed     Open     Closed

  COM4 (2E8h)     Open      Open     Closed

                               INTERRUPT

        Setting           JP2/A     JP2/B     JP2/C    JP2/D     JP2/E

          IRQ2            Closed    Open      Open      Open     Open

          IRQ3             Open     Closed    Open      Open     Open

          IRQ4             Open     Open      Closed    Open     Open

          IRQ5             Open     Open      Open     Closed    Open

          IRQ7             Open     Open      Open      Open     Closed

                         SUPPORTED COMMAND SET

                           Basic AT Commands

  AT, A/, +++

  A, B, E, F, H, M, O, P, T, V

  &C, &G, &T, &W

                              S Registers

  S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S18, S25, S38



                            Special Commands

  #CID



  Note: See MHI Help File for full command documentation.

                         PROPRIETARY AT COMMAND SET

                                   DIAL

  Type:                  Immediate

  Format:                AT [cmds] D<#> [cmds]

  Description:           Dials telephone number according to any
                         modifiers included in the string

  Note:                  Any combination of modifiers can be used to
                         produce the desired dial functions in sequence.

        Command                              Function

          DL             Re-dial last number

          DP             Pulse dialing enabled

          DR             Answer mode enabled; originate mode disabled
                         following handshake initiation.

         DS=n            Dial stored telephone number n

          DT             Tone dialing enabled/Pulse dialing disabled

          DW             Dialing resumed following dial tone detection

          D,             Dialing paused for amount of time specified in
                         S8 register

        D"WXY"           Optional method of denoting telephone numbers.
                         Letters enclosed in quotes are interpreted as
                         numbers according to the system found on a
                         telephone keypad.

          D!             Flash function initiated. Modem commanded to go
                         off-hook for specified time before returning
                         on-hook.

          D@             Wait for Quite Answer function enabled. Modem
                         waits until a "quiet answer," a ring-back signal
                         followed by silence up to the time specified in
                         S7, is received prior to executing the rest of
                         the dial string.

          D/             Delays 125 ms. Before proceeding with dial
                         string

          D$             Displays list of commands

          D;             Modem returned to idle state after dialing. The
                         semicolon can only be placed at the end of the
                         dial command.

                            REPORT INFORMATION

  Type:          Immediate

  Format:        AT [cmds] In [cmds]

  Description:   Displays information requested

    Command                              Function

       I0        Reports four digit product code

       I1        Reports ROM checksum

       I2        Reports RAM checksum

       I3        Reports product type

       I4        Reports current modem settings

       I5        Reports NVRAM settings

       I6        Reports data connection information

       I7        Reports manufacturer and model information

                              SPEAKER VOLUME

  Type:          Configuration

  Format:        AT [cmds] Ln [cmds]

  Description:   Controls speaker volume

    Command                              Function

       L0        Low volume setting

       L1        Low volume setting

       L2        Medium volume setting

       L3        Highest volume setting

                               RESULT CODES

  Type:          Configuration

  Format:        AT [cmds] Qn [cmds]

  Description:   Enables modem to send result codes to the DTE

    Command                              Function

       Q0        Result code sending enabled

       Q1        Result code sending disabled

       Q2        Result code sending only in originate mode

                     SELECT CALL PROGRESS RESULT CODES

  Type:                  Configuration

  Format:                AT [cmds] Xn [cmds]

  Description:           Enables selection of tone detection and
                         associated result code format options

        Command                              Function

           X0            Busy and dial tone detection disabled; result
                         codes 0 - 4, 155 enabled.

           X1            Busy and dial tone detection disabled; result
                         codes 0 - 5, 10, 13 - 155 enabled.

           X2            Busy tone detection disabled, dial tone
                         detection enabled; result codes 0 - 6, 10, 13 -
                         155 enabled.

           X3            Busy tone detection enabled, dial tone detection
                         disabled; result codes 0 - 5, 7, 8, 10, 13 - 155
                         enabled.

           X4            Busy and dial tone detection enabled; result
                         codes 0 - 8, 10 - 155 enabled.

                           LONG SPACE DISCONNECT

  Type:          Configuration

  Format:        AT [cmds] Yn [cmds]

  Description:   Commands disconnection configuration

    Command                              Function

       Y0        Profile 0 in NVRAM

       Y1        Profile 1 in NVRAM

                                SOFT RESET

  Type:                Immediate

  Format:              AT [cmds] Zn [cmds]

  Description:         Restores modem profiles previously saved in
                       non-volatile RAM using the &W command.

       Command                              Function

          Z0           Restore setting to profile selected by Y

          Z1           Restore setting NVRAM profile 0

          Z2           Restore setting NVRAM profile 1

          Z3           Restores setting to factory default profile 0
                       (&F0)

          Z4           Restores setting to factory default profile 1
                       (&F1)

          Z5           Restores setting to factory default profile 2
                       (&F2)

                      AUTO-ANSWER - ORIGINATE/ANSWER

  Type:          Configuration

  Format:        AT [cmds] &An [cmds]

  Description:   Enables or disables additional result code subsets

    Command                              Function

      &A0        ARQ result codes disabled

      &A1        ARQ result codes enabled

      &A2        V.32 modulation indicator added

      &A3        Protocol indicators added

                             SERIAL PORT RATE

  Type:          Configuration

  Format:        AT [cmds] &Bn [cmds]

  Description:   Manages the serial port rate

    Command                              Function

      &B0        Variable, follows connection rate

      &B1        Fixed serial port rate

      &B2        Fixed in ARQ mode, variable in non-ARQ mode

                         DATA TERMINAL READY (DTR)

  Type:          Configuration

  Format:        AT [cmds] &Dn [cmds]

  Description:   Selects modem response to DTR

    Command                              Function

      &D0        DTR override

      &D1        DTR toggle causes online command mode

      &D2        Normal DTR operations

      &D3        Resets on receipt of DTR

                          FACTORY DEFAULT PROFILE

  Type:             Configuration

  Format:           AT [cmds] &F [cmds]

  Description:      Sets values in active profile to values found in the
                    default profile

     Command                              Function

       &F0          Generic template

       &F1          Hardware flow control template

       &F2          Software flow control template

                        TRANSMIT DATA FLOW CONTROL

  Type:          Configuration

  Format:        AT [cmds] &Hn [cmds]

  Description:   Enables TD flow control options

    Command                              Function

      &H0        Flow control disabled

      &H1        CTS flow control enabled

      &H2        XON/XOFF flow control enabled

      &H3        Hardware and software flow control enabled

                         RECEIVE DATA FLOW CONTROL

  Type:          Configuration

  Format:        AT [cmds] &Hn [cmds]

  Description:   Enables RD flow control options

    Command                              Function

      &I0        Software flow control disabled

      &I1        XON/XOFF signals to modem and remote system

      &I2        XON/XOFF signals only to modem

                             DATA COMPRESSION

  Type:          Configuration

  Format:        AT [cmds] &Kn [cmds]

  Description:   Enables/disables data compression

    Command                             Line Type

      &K0        Disable data compression

      &K1        Auto enable/disable

      &K2        Data compression enabled

      &K3        MNP5 compression disabled

                               ERROR CONTROL

  Type:          Configuration

  Format:        AT [cmds] &Mn [cmds]

  Description:   Sets error control for connections at 1200bps and higher

    Command                                Mode

      &M0        Error control disabled

      &M4        Normal/ARQ mode.

      &M5        ARQ mode

                       CONNECTION SPEED UPPER LIMIT

  Type:                  Configuration

  Format:                AT [cmds] &Nn [cmds]

  Description:           Sets required connection speed if &U is set to
                         0; otherwise, sets fastest allowed connection
                         speed.

        Command                              Function

          &N0            No maximum connect speed.

          &N1            Set maximum connect speed to 300bps.

          &N2            Set maximum connect speed to 1200bps.

          &N3            Set maximum connect speed to 2400bps.

          &N4            Set maximum connect speed to 4800bps.

          &N5            Set maximum connect speed to 7200bps.

          &N6            Set maximum connect speed to 9600bps.

          &N7            Set maximum connect speed to 12Kbps.

          &N8            Set maximum connect speed to 14.4Kbps.

          &N9            Set maximum connect speed to 16.8Kbps.

          &N10           Set maximum connect speed to 19.2Kbps.

          &N11           Set maximum connect speed to 21.6Kbps.

          &N12           Set maximum connect speed to 24Kbps.

          &N13           Set maximum connect speed to 26.4Kbps.

          &N14           Set maximum connect speed to 28.8Kbps.

          &N15           Set maximum connect speed to 31.2Kbps.

          &N16           Set maximum connect speed to 33.6Kbps.

                            PULSE DIALING RATIO

  Type:          Configuration

  Format:        AT [cmds] &Pn [cmds]

  Description:   Selects pulse dial make/break ratio

    Command                              Function

      &P0        39/61ms at 10pps (North America)

      &P1        33/67ms at 10pps (Europe)

                                    RTS

  Type:          Configuration

  Format:        AT [cmds] &Rn [cmds]

  Description:   Selects RTS/CTS options

    Command                              Function

      &R1        RTS ignored

      &R2        Received data to computer only on RTS

                           DATA SET READY (DSR)

  Type:          Configuration

  Format:        AT [cmds] &Sn [cmds]

  Description:   Selects DSR options

    Command                              Function

      &S0        DSR forced high

      &S1        DSR high only while modem is handshaking or connected

                       CONNECTION SPEED LOWER LIMIT

  Type:            Configuration

  Format:          AT [cmds] &Un [cmds]

  Description:     Sets slowest allowed connection speed if &N is set to
                   1 or higher.

     Command                              Function

       &U0         No minimum connect speed.

       &U1         Set minimum connect speed to 300bps.

       &U2         Set minimum connect speed to 1200bps.

       &U3         Set minimum connect speed to 2400bps.

       &U4         Set minimum connect speed to 4800bps.

       &U5         Set minimum connect speed to 7200bps.

       &U6         Set minimum connect speed to 9600bps.

       &U7         Set minimum connect speed to 12Kbps.

       &U8         Set minimum connect speed to 14.4Kbps.

       &U9         Set minimum connect speed to 16.8Kbps.

       &U10        Set minimum connect speed to 19.2Kbps.

       &U11        Set minimum connect speed to 21.6Kbps.

       &U12        Set minimum connect speed to 24Kbps.

       &U13        Set minimum connect speed to 26.4Kbps.

       &U14        Set minimum connect speed to 28.8Kbps.

       &U15        Set minimum connect speed to 31.2Kbps.

       &U16        Set maximum connect speed to 33.6Kbps.

                              BREAK HANDLING

  Type:          Configuration

  Format:        AT [cmds] &Yn [cmds]

  Description:   Sets destructive/nondestructive break handling

    Command                              Function

      &Y0        Destructive, but doesnt send break

      &Y1        Destructive, expedited

      &Y2        Nondestructive, expedited

      &Y3        Nondestructive, unexpedited

                          STORE TELEPHONE NUMBER

  Type:               Configuration

  Format:             AT [cmds] &Zn=(phone # & modifiers)

  Description:        Writes selected telephone numbers into the
                      non-volatile memory at location n

      Command                              Function

       &Zn=s          Writes phone number string s to NVRAM at position n

       &Zn=L          Writes last executed dial string to NVRAM at
                      position n (n=1-3)

        &Zn?          Displays the phone number stored at position n
                      (n=0-3)

        &ZL?          Displays last executed dial string

                            S(STATUS) -REGISTERS

                          BIT-MAPPED REGISTER S13

  Format:          AT [cmds] S13=n [cmds]

  Range:           0-174

  Unit:            Bit-mapped

  Description:     Controls reset, dial mode

   Bit    Value                           Function

    0          0   Unidentified

              1    Resets when DTR drops

    1          0   Unidentified

              1    Resets non-MNP transmit buffer from 1.5K to 128bytes

    2          0   Unidentified

              1    Sets backspace key to delete

    3          0   Unidentified

              1    On DTR signal, auto dials number stared at NVRAM
                   position 0

    4          0   Unidentified

              1    At power on/reset, auto dials number stared at NVRAM
                   position 0

    5         0    Reserved

    6         0    Reserved

    7       0 1    Unidentified

                   Disconnect on escape code

                          BIT-MAPPED REGISTER S15

  Format:          AT [cmds] S15=n [cmds]

  Unit:            Bit-mapped

  Description:     Disable/Enable MNP

   Bit    Value                           Function

    0          0   Enable ARQ/MNP for V.22

              1    Disable ARQ/MNP for V.22

    1          0   Enable ARQ/MNP for V.22bis

              1    Disable ARQ/MNP for V.22bis

    2          0   Enable ARQ/MNP for V.32/V.32bis/V.32terbo

              1    Enable ARQ/MNP for V.32/V.32bis/V.32terbo

    3          0   Enable MNP handshake

              1    Disable MNP handshake

    4          0   Enable MNP level 4

              1    Disable MNP level 4

    5          0   Enable MNP level 3

              1    Disable MNP level 3

    6          0   MNP compatibility

              1    MNP incompatibility

    7       0 1    Enable V.42 operation

                   Disable V.42 operation

                                TEST MODES

  Type:            Register

  Format:          AT [cmds] S16=n [cmds]

  Unit:            Bit-mapped

  Description:     Controls touch tone dialing test.

   Bit    Value                           Function

    0         0    Reserved

    2          0   Touch tone dialing test not in progress

              1    Touch tone dialing test in progress

    4          0   Internal test pattern not in use

              1    Internal test pattern in use

                             INACTIVITY TIMER

  Type:                  Register

  Format                 AT [cmds] S19=n [cmds]

  Range:                 0-255

  Unit:                  10 seconds

  Description:           Maximum duration of DTE and DCE inactivity
                         allowed prior to initiating hang-up process.

            Note: S19=0 disables the timer and allows indefinite
            inactivity.

                               BREAK LENGTH

  Type:           Register

  Format          AT [cmds] S21=n [cmds]

  Unit:           10ms

  Description:    Sets duration of breaks sent from the modem to the
                  computer

            Note: Applies to MNP or V.42 mode only.

                       FLOW CONTROL CHARACTER - XON

  Type:          Register

  Format:        AT [cmds] S22=n [cmds]

  Range:         0-255

  Unit:          ASCII

  Description:   Sets the character used to represent XON

                       FLOW CONTROL CHARACTER - XOFF

  Type:          Register

  Format:        AT [cmds] S23=n [cmds]

  Range:         0-255

  Unit:          ASCII

  Description:   Sets the character used to represent XOFF

                          BIT-MAPPED REGISTER S27

  Format                 AT [cmds] S27=n [cmds]

  Range:                 0-255

  Unit:                  Bit-mapped

  Description:           Enables/disables modulation protocols

   Bit        Value                         Function

    0                0   Disable ITU-T modulation at 300bps for overseas
                         calls: in V.21 mode, the modem answers both
                    1    overseas and domestic calls, but only originates
                         V.21 calls

                         Enable ITU-T modulation at 300bps for overseas
                         calls: in V.21 mode, the modem answers both
                         overseas and domestic calls, but only originates
                         V.21 calls

    1                0   Disable unencoded modulation in V.32 mode

                    1    Enable unencoded modulation in V.32 mode

    2                0   Enable V.32 modulation

                    1    Disable V.32 modulation

    3                0   Enable 2100Hz answer tone

                    1    Disable 2100Hz answer tone

    4                0   Disable V.23 fallback mode

                    1    Enable V.23 fallback mode

    5                0   Enable V.32bis mode

                    1    Disable V.32bis mode

    6                0   Enable V.42 selective reject

                    1    Disable V.42 selective reject

    7             0 1    Enable codes

                         Disable codes and displays 900 code instead

                              CONNECTION TIME

  Type:          Register

  Format         AT [cmds] S28=n [cmds]

  Range:         0-255

  Unit:          .01 second

  Description:   Sets V.32 duration

    Command                              Function

     S28=0       Eliminates the V.32 answer tone for a faster connection

     S28=8       Times are in .1 second

    S28=255      Disable connections except V.32 at 9600bps

                              FALLBACK TIMER

  Type:          Register

  Format         AT [cmds] S29=n [cmds]

  Range:         0-255

  Unit:          .01 second

  Description:   Sets the duration of the V.21 answer mode fallback timer

                          BIT-MAPPED REGISTER S32

  Format:            AT [cmds] S32=n [cmds]

  Range:             0-255

  Description:       Select setup for 28.8 and higher speed modems

     Bit        Value                       Function

      0              0  Disable V.8 call indicate

                    1   Enable V.8 call indicate

      1              0  Disable V.8 mode

                    1   Enable V.8 mode

      2             0   Reserved

      3              0  Enable V.34 modulation

                    1   Disable V.34 modulation

      4              0  Enable V.34+ modulation

                    1   Disable V.34+ modulation

     5-7            0   Reserved

                          BIT-MAPPED REGISTER S33

  Format:            AT [cmds] S33=n [cmds]

  Range:             0-255

  Description:       Disable/enable data rates

     Bit        Value                       Function

      0              0  Enable 2400 symbol rate

                    1   Disable 2400 symbol rate

      1              0  Enable 2743 symbol rate

                    1   Disable 2743 symbol rate

      2             0   Enable 2800 symbol rate

                        Disable 2800 symbol rate

      3              0  Enable 3000 symbol rate

                    1   Disable 3000 symbol rate

      4              0  Enable 3200 symbol rate

                    1   Disable 3200 symbol rate

      5              0  Enable 3429 symbol rate

                    1   Disable 3429 symbol rate

      6             0   Reserved

      7              0  Enable shaping

                    1   Disable shaping

                          BIT-MAPPED REGISTER S34

  Format:            AT [cmds] S34=n [cmds]

  Range:             0-255

  Description:       Disable/enable trellis encoding

     Bit        Value                       Function

      0              0  Enable 8S-2D trellis encoding

                    1   Disable 8S-2D trellis encoding

      1              0  Enable 16S-4D trellis encoding

                    1   Disable 16S-4D trellis encoding

      2              0  Enable 32S-2D trellis encoding

                    1   Disable 32S-2D trellis encoding

      3              0  Enable 64S-4D trellis encoding

                    1   Disable 64S-4D trellis encoding

      4              0  Enable non-linear coding

                    1   Disable non-linear coding

      5              0  Enable TX level deviation

                    1   Disable TX level deviation

      6              0  Enable pre-emphasis

                    1   Disable pre-emphasis

      7              0  Enable pre-coding

                    1   Disable pre-coding

                          BIT-MAPPED REGISTER S35

  Format:            AT [cmds] S35=n [cmds]

  Range:             0-255

  Description:       Limits back channel rate

     Bit        Value                       Function

     0-2             0  Back channel rate not limited

                     1  28800 max.

                     2  26400 max.

                     3  24000 max.

                     4  21600 max.

                     5  19200 max.

                     6  16800 max.

                    7   14400 max.

      3              0  Normal RBS operation

                    1   Forced RBS operation

     4-7             0  Reserved

                    1   Reserved

                          BIT-MAPPED REGISTER S41

  Format:            AT [cmds] S41=n [cmds]

  Range:             0-255

  Description:       Enable/disable distinctive ring

     Bit        Value                       Function

      0              0  Disable distinctive ring

                    1   Enable distinctive ring

     1-7            9   Reserved



